gistfile1.sh

#!/bin/sh -e

is_enabled () {
    local device="$1"
    s=$(xinput --list-props "$device" | fgrep 'Device Enabled' | egrep -o '[01]$')
    if [ "${s}" = "1" ]; then
        return 0 # enabled
    elif [ "${s}" = "0" ]; then
        return 1 # disabled
    else
        echo Pointer status unknown! >&2
        exit 1
    fi
}

set_status () {
    local device="$1"
    local status="$2"
    xinput --set-prop "${device}" 'Device Enabled' "${status}"
}

case "$(hostname -f)" in
    reaver.mxey.lan)
        device='Logitech USB-PS/2 Optical Mouse'
        ;;
    *)
        echo Unknown host! >&2
        exit 1
        ;;
esac

if is_enabled "$device"; then
    set_status "$device" 0
else
    set_status "$device" 1
fi